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采用数值模拟方法研究了不同磁感应强度下电磁制动(EMBr)对某钢厂结晶器流场、传热以及夹杂物去除的影响.结果表明采用电磁制动,结晶器内流体的表面流速增加,对窄面冲击深度减少,结晶器自由表面温度升高,高温区上移而且范围扩大.随着磁感应强度增加,自由液面温度提高2~5℃,这有助于保护渣的熔化,可改善弯月面的钢液流动特性.夹杂物尺寸越大,越容易为结晶器液面所吸收去除,对于尺寸大于30μm的夹杂物,磁感应强度越大,夹杂物越容易被结晶器保护渣所吸收
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对采用转炉-RH精炼-连铸工艺生产的IF钢连铸板坯在不同浇铸阶段(开浇、正常、两炉交接及浇铸末期)的铸坯洁净度进行了较为细致地研究和对比分析.由于浇铸初期存在二次氧化及较大程度地增碳,开浇坯[C],[O]T,[N]含量远高于其他时间段的铸坯,并存在较大尺寸的簇群状Al2O3夹杂.正常坯夹杂主要为尺寸较小(≤ 30μm)的块状及少量簇群状Al2O3夹杂(≤ 40μm),交接坯及尾坯仍以较小尺寸的块状Al2O3夹杂为主,但存在极少量大于100μm的复合夹杂
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第1节 引言 第2节 抽样定理 第3节 脉冲振幅调制 第4节 模划信号的量化 第5节 脉冲编码调制 第6节 增量调制 第7节 PCM与△M的性能比较 第9节 TDM和多路数字电话
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Chapter 1 Introduction Chapter 2 Manufacture of 3D Fibre Preforms Chapter 3 Preform Consolidation Chapter 4 Micromechanics Models for Mechanical Properties Chapter 5 3D Woven Composites Chapter 6 Braided Composite Materials Chapter 7 Knitted Composite Materials Chapter 8 Stitched Composites Chapter 9 Z-Pinned Composites
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Chapter 2 Water Chapter 3 Amino Acids, Peptides, and Proteins Chapter 4 The Three-Dimensional Structure of Proteins Chapter 5 Protein Function Chapter 6 Enzymes Chapter 8 Nucleotides and Nucleic Acids Chapter 9 DNA-Based Information Technologies Chapter 11 Biological Membranes and Transport Chapter 12 Biosignaling Chapter 13 Bioenergetics and Biochemical Reaction Types Chapter 14 Glycolysis, Gluconeogenesis, and the Pentose Chapter 16 The Citric Acid Cycle Chapter 17 Fatty Acid Catabolism Chapter 18 Amino Acid Oxidation and the Production of Urea Chapter 19 Oxidative Phosphorylation and Photophosphorylation Chapter 20 Carbohydrate Biosynthesis in Plants and Bacteria Chapter 22 Biosynthesis of Amino Acids, Nucleotides, and Related Molecules Chapter 24 Genes and Chromosomes Chapter 25 DNA Metabolism Chapter 26 RNA Metabolism Chapter 28 Regulation of Gene Expression
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Part I Molecular Components of Cells 1 The Facts of Life: Chemistry Is the Logic of Biological Phenomena 2 Water: The Medium of Life 3 Thermodynamics of Biological Systems 4 Amino Acids and the Peptide Bond 5 Proteins: Their Primary Structure and Biological Functions 6 Proteins: Secondary, Tertiary, and Quaternary Structure 7 Carbohydrates and the Glycoconjugates of Cell Surfaces 8 Lipids 9 Membranes and Membrane Transport 10 Nucleotides and Nucleic Acids 11 Structure of Nucleic Acids 12 Recombinant DNA, Cloning, Chimeric Genes, and Synthetic Biology Part II Protein Dynamics 13 Enzymes—Kinetics and Specificity 14 Mechanisms of Enzyme Action 15 Enzyme Regulation 16 Molecular Motors Part III Metabolism and Its Regulation Part IV Information Transfer
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3.2.5行列式的按任意列展开和特殊矩阵的行列式 1、行列式的按任意行(列)展开 定义命A=(-1)M,称为a的代数余子式
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1.根据下列配离子的空间构型,画出它们形成时中心离子的价层电子分布,并指出它们以何 种杂化轨道成键,估计其磁矩(B.M.)各为多少? [CuCl2](直线形)
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I THE EVIDENCE ON CONVERGENCE A Formal Legal Change B The Structure of Share Ownership C The Growth of European Stock Markets D The Emergence of an International Market for Corporate Control E A Preliminary Evaluation F The Status of the Insider-Dominated Firm II WHEN DOES SEPARATION OF OWNERSHIP AND CONTROL ARISE? A HISTORICAL PERSPECTIVE A The United States Experience 1 The Role of Investment Bankers 2 The New York Stock Exchange as Guardian of the Public Investor B The British Experience C A Civil-Law Contrast: The French Experience D The German Experience: Statist Intervention That Stunted the M arket E A Preliminary Summary III\ DOES LAW MATTER?\ RECONSIDERED A Law and the Decentralized Common-Law World B The Sequence of Legal Change: Reinterpreting LLS&V 1 The United States Experience 2 The Global Experience C The Political Theory of Dispersed Ownership D Implications for Transitional Economies IV C ONCLUSION
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以纳米W,Cu粉末为原料,通过测定H2中热压烧结和无压烧结的收缩动力学曲线, 研究了纳米W-40%Cu化学混合粉末的致密化过程.对比了纳米W粉与常规Cu粉(-44μm) 的机械混合粉和纳米W-Cu化学混合粉的热压烧结致密化过程.测定了烧结合金在300℃和500℃下高温应力-应变曲线.实验结果表明:采用纳米W-40%Cu化学混合粉末在H2中无压烧结时最大收缩速率对应温度为980℃;1200℃烧结平均晶粒小于2μm,相对密度为97%.纳米W-Cu化学混合粉在H2热压烧结时最大收缩速率对应温度为930℃;1200℃烧结合金的平均晶粒为0.5μm,相对密度为98%.纳米W-Cu化学混合粉热压合金高温抗压强度比纳米W 与常规Cu粉的热压合金高
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